Question

两道方程不会解，我六年级

X+2.5×2.25％X=5625
4=X-X20％

Answer 1

题目1大概写错了吧、做出来都有小数点的：X+2.5x2.25%X=5625
X+2.5x0.0225X=5625
X+0.05625X=5625
(1+0.05625)X=5625
1.05625X=5625
X=5325.443~
第二题：4=X-X20%
4=(1-0.2)X
4=0.8X
X=5

Answer 2

4=x-x20% X+2.5x2.25%X=5625
X- X20%=4 解: X+2.5x0.0225X=5625
80%X=4 X+0.05625X=5625
X=4除0.8 (1+0.05625)X=5625
X=5 1.05625X=5625
X=5325.443~

Answer 3

X+2.5×2.25％X=5625 4=X-X20％
x+0.05625x=5625 4=x(1-20％ )
x= 562500000\105625 4=80% x
x=5325 x=5

Answer 4

1.x=10000
2.x=5